Liquid-phase degradation of HDPE over alkali-treated MFI zeolites with mesopores

被引:29
作者
Choi, Dong Ho
Park, Ji Won
Kim, Jong-Ho
Sugi, Yoshihiro
Seo, Gon
机构
[1] Chonnam Natl Univ, Sch Appl Chem Engn, Kwangju 500757, South Korea
[2] Chonnam Natl Univ, Inst Catalysis Res, Kwangju 500757, South Korea
[3] Gifu Univ, Fac Engn, Dept Mat Sci & Technol, Gifu 5011193, Japan
关键词
liquid-phase catalytic degradation; MFI zeolite; alkali treatment; HDPE; mesopore;
D O I
10.1016/j.polymdegradstab.2006.09.002
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The catalytic activities of MFI zeolites treated with NaOH solutions of various concentrations were investigated in the liquid-phase degradation of HDPE. The changes in the crystallinity, pore structure and acidity of MFI zeolites according to the alkali treatment were also examined. The parent MFI zeolite composed of large particles showed very poor activity, but the treatment with moderate NaOH solutions of 0.4-0.7 N enhanced considerably the catalytic activity of MFI zeolite by enlarging its external surface area due to the formation of mesopores. The activity of MFI zeolite was improved by about 20 times treated with 0.5 N NaOH solution. The formation of mesopores also contributed to the enhancement of the yield of liquid products by suppressing further cracking due to the rapid diffusion of products. The treatment with strong NaOH solution, however, lowered the catalytic activity because the treatment caused the loss of both crystalline structure and strong acid sites. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2860 / 2866
页数:7
相关论文
共 14 条
[1]   Liquid-phase degradation of HDPE over alkali-treated MOR catalysts [J].
Jeong, SW ;
You, YS ;
Kim, JH ;
Seo, G .
SCIENCE AND TECHNOLOGY IN CATALYSIS 2002, 2003, 145 :469-470
[2]   Catalytic cracking of n-octane over alkali-treated MFI zeolites [J].
Jung, JS ;
Park, JW ;
Seo, G .
APPLIED CATALYSIS A-GENERAL, 2005, 288 (1-2) :149-157
[3]   Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites [J].
Ogura, M ;
Shinomiya, SY ;
Tateno, J ;
Nara, Y ;
Nomura, M ;
Kikuchi, E ;
Matsukata, M .
APPLIED CATALYSIS A-GENERAL, 2001, 219 (1-2) :33-43
[4]   The effect of pore shape on the catalytic performance of zeolites in the liquid-phase degradation of HDPE [J].
Park, JW ;
Kim, JH ;
Seo, G .
POLYMER DEGRADATION AND STABILITY, 2002, 76 (03) :495-501
[5]   Gold-induced crystallization of SiO2 and TiO2 powders [J].
Perkas, N ;
Pol, VG ;
Pol, SV ;
Gedanken, A .
CRYSTAL GROWTH & DESIGN, 2006, 6 (01) :293-296
[6]   Liquefaction of polyethylene wax over solid acid catalysts [J].
Shim, JS ;
You, YS ;
Kim, JH ;
Seo, G .
SCIENCE AND TECHNOLOGY IN CATALYSIS 1998, 1999, 121 :465-468
[7]  
SHIM JS, 1998, HWAHAK KONGHAK, V36, P447
[8]   The quartz-cristobalite transformation in heated chert rock composed of micro and crypto-quartz by micro-Raman and FT-IR spectroscopy methods [J].
Shoval, S ;
Champagnon, B ;
Panczer, G .
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 1997, 50 (1-2) :203-213
[9]   PRODUCTION OF HIGH-QUALITY GASOLINE BY CATALYTIC CRACKING OVER RARE-EARTH-METAL EXCHANGED Y-TYPE ZEOLITES OF HEAVY OIL FROM WASTE PLASTICS [J].
SONGIP, AR ;
MASUDA, T ;
KUWAHARA, H ;
HASHIMOTO, K .
ENERGY & FUELS, 1994, 8 (01) :136-140
[10]   Deactivation behaviors of zeolite and silica-alumina catalysts in the degradation of polyethylene [J].
Uemichi, Y ;
Hattori, M ;
Itoh, T ;
Nakamura, J ;
Sugioka, M .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (03) :867-872